Breast pain can be caused by a variety of factors,many causes, including
>injury to the breast.
>Sometimes pain can come from surrounding muscles or tissues rather than the breast itself Lumpy breasts due to fibrocystic breast tissue can cause breast soreness and pain.
>Hormone fluctuations can also cause pain or discomfort.
>Emotional stress can affect hormones, no matter where you are in your cycle
>hormone fluctuation, the hormones estrogen and progesterone
>Abnormal prolactin levels may play a role in breast pain.
>taking certain medication and pills may give certain tenderness of breast especially the hormonal pills containg estrogen you will feel fullness and soreness.
>having other symptoms in your body or some illness or some diseases in other part of your body may has an effect on the breast and cause pain
>if the pain in one breast only there may be other cause than a hormonal cause ,like a lump or inflamation ,...
however ,breast pain is not usually linked to breast cancer. Having breast pain or fibrocystic breasts does not mean you are at higher risk of developing cancer,If you have breast pain that is localized in only one area or you have lump that is attached to skin for long and that is consistent through the month with no fluctuations in pain level you must be seen by doctor where mammography should be done and further testing depending on the results like needle biopsy .